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Liquid crystalline medium

A technology of liquid crystal media and compounds, applied in the field of liquid crystal displays, can solve problems such as the adverse effects of response time, and achieve the effects of good response time, fast response time, and low threshold voltage

Inactive Publication Date: 2015-02-25
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, liquid crystal materials with high birefringence known in the prior art generally also have high rotational viscosity at the same time, which adversely affects the response time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0333] Prepare the formula according to the following scheme compound of:

[0334]

[0335] C 20 S B 74 N 78 I; Δn=0.057; Δε=-0.82; γ 1 =28mPa·s;

[0336] The following compounds were similarly prepared:

[0337]

[0338]

[0339] Mixture Example

[0340] Unless otherwise stated, photoelectric data were measured at 20° C. in a TN cell at the 1st minimum (ie at a d·Δn of 0.5 μm). Optical data were measured at 20°C unless otherwise stated. Unless otherwise stated, all physical properties are determined according to "Merck Liquid Crystals, Physical Properties of Liquid Crystals" Status Nov. 1997, Merck KGaA, Germany and carried out at a temperature of 20°C.

Embodiment M1

[0342]

Embodiment M2

[0344]

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PUM

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Abstract

The invention relates to a liquid-crystalline medium comprising at least one compound of the formula I, in which R1 has the meanings indicated in Claim 1, and to the use thereof in liquid-crystalline media and in electro-optical liquid-crystal displays.

Description

technical field [0001] The invention relates to liquid crystal media (LC media), their use for electro-optical purposes, and to liquid crystal displays comprising the media. Background technique [0002] Liquid crystals are mainly used as dielectrics in display devices because the optical properties of such substances can be changed by an applied voltage. Electro-optical devices based on liquid crystals are very well known to those skilled in the art and can be based on various effects. Examples of such devices are cells with dynamic scattering, DAP (distortion of aligned phase) cells, guest / host cells, TN cells with twisted nematic structure, STN (super twisted nematic) cells, SBE (super birefringence effect) boxes and OMI (Optical Mode Interference) boxes. The most common display devices are based on the Schadt-Helfrich effect and have a twisted nematic structure. Furthermore, there are cells which operate with an electric field parallel to the substrate and liquid crys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/30C09K19/46G02F1/1333C07C13/28
CPCC09K19/14C09K19/3003C09K2019/3004C09K2019/3083C09K2019/0414C09K19/20C09K2019/3016C09K19/44C09K2019/0466C09K2019/301C09K2019/122C09K19/3068C09K2019/123C09K2019/3422C09K2019/0448C09K19/0403C09K2019/0407
Inventor 马克·格贝尔拉斯·利曹萨比恩·肖恩安德列亚斯·珀勒
Owner MERCK PATENT GMBH